Accès ouvert déclaré
2017
preprint
Theia: Faint objects in motion or the new astrometry frontier
The Theia Collaboration, Celine Boehm, Alberto Krone-Martins, António Amorim, Guillem Anglada-Escudé, Alexis Brandeker, F. Courbin, Torsten Enßlin, António Falcão, Katherine Freese, Berry Holl, Lucas Labadie, Alain Léger, Fabien Malbet, Gary Mamon, Barbara McArthur, Alcione Mora, Michael Shao, Alessandro Sozzetti, Douglas Spolyar, Eva Villaver, C. Albertus, S. Bertone, H. Bouy, Michael Boylan-Kolchin, Anthony Brown, Warren Brown, Vitor Cardoso, L. Chemin, Riccardo Claudi, Alexandre C. M. Correia, Mariateresa Crosta, Antoine Crouzier, Francis-Yan Cyr-Racine, Mario Damasso, Antônio da Silva, Melvyn Davies, Payel Das, Pratika Dayal, Miguel de Val-Borro, Antonaldo Diaferio, Adrienne Erickcek, Malcolm Fairbairn, M. Fortin, M Fridlund, P García, Oleg Gnedin, A. Goobar, Paulo Gordo, Renaud Goullioud, Nigel; id_orcid 0000-0002-9901-9064 Hambly, Nathan Hara, David Hobbs, Erik Høg, A. Holland, Rodrigo Ibata, Carme Jordi, Sergei KLIONER, Prof. Sergei Kopeikin, Thomas Lacroix, Jacques Laskar, C. Le Poncin-Lafitte, Xavier Luri, Subhabrata Majumdar, Valeri Makarov, Richard MASSEY, Bertrand MENNESSON, Daniel Michalik, Andre Moitinho de Almeida, Ana Mourão, Leonidas Moustakas, Neil Murray, Matthew MUTERSPAUGH, Micaela Oertel, L. Ostorero, Angeles Perez-Garcia, I. Platais, Jordi Portell i de Mora, Andreas Quirrenbach, Lisa Randall, Justin READ, Enikő Regős, Barnes Rory, Krzysztof RYBICKI, Pat Scott, Jean Schneider, Jakub Scholtz, A. Siebert, Ismael Tereno, John Tomsick, Wesley Traub, Monica Valluri, Matt Walker, Nicholas Walton, Laura Watkins, G Edward White, Dafydd Wyn Evans, Ł. Wyrzykowski, R. F. G. Wyse
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Le résumé fourni par la source
In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint objects in the Universe. Theia is primarily designed to study the local dark matter properties, the existence of Earth-like exoplanets in our nearest star systems and the physics of compact objects. Furthermore, about 15 $\\%$ of the mission time was dedicated to an open observatory for the wider community to propose complementary science cases. With its unique metrology system and "point and stare" strategy, Theia's precision would have reached the sub micro-arcsecond level. This is about 1000 times better than ESA/Gaia's accuracy for the brightest objects and represents a factor 10-30 improvement for the faintest stars (depending on the exact observational program). In the version submitted to ESA, we proposed an optical (350-1000nm) on-axis TMA telescope. Due to ESA Technology readiness level, the camera's focal plane would have been made of CCD detectors but we anticipated an upgrade with CMOS detectors. Photometric measurements would have been performed during slew time and stabilisation phases needed for reaching the required astrometric precision.
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Les sujets associés
Astronomy and Astrophysical ResearchStellar, planetary, and galactic studiesSpacecraft Design and Technology